Remove wURL.

Would love to eventually get this in Raddocs as a side library, but for
now it's too far of a stretch to be in RAD.
Remove all assets and update html example
Update steps for div => pre change
Remove url prefix config
Remove html output from example app
Update raddocs to github version in example app
Merge branch 'master' into remove_assets

Conflicts:
	lib/rspec_api_documentation/wurl_writer.rb
Remove notice from previous release.

No need to warn people about the current version.
Merge pull request #66 from zipmark/remove_assets

Remove assets